This piece is an expression of the duality of human beings, torn between desire and solitude. The bigger the desire becomes, the tougher the solitary confinement of our minds becomes. The marble in a glass plate and a large closed door in the piece represent desire and solitude respectively. The marble slowly rolls towards the desire. It rolls faster and faster–and louder and louder–but cannot depart from the confines of the plate. The marble stands before solitude. When solitude vanishes, the marble rolls again. The closed door is human solitude. The door is attempted to be prized open but remains shut still. It is pushed against more strongly, to the point of being dented. The door groans in pain. It still remains shut as if being full from within. It defies any entrant. The marble and the door are unified in their isolation. Self-confined space is sad.